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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fb0d1e65991596956ff66d06c8cb6810141a24a87638d5ad66d933e0fa25f6' 
  AND token = 'IEqdp/O3+9GP4QQBZDyhc4hTjA50XaI8P05HQnkEVxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}